I'm a newcomer to FCPX, but I think I've found a bug in 10.0.5. It exists in 10.0.3 and 10.0.4, the other two versions I have tried.
I am using FCPX to edit screencasts. I record my screen and microphone using SnapzProX and import the clip into FCPX in order to remove unwanted sections. The bug I think I've found is that under certain circumstances, when I cut a portion of a clip out, significant portions of the audio track will get overlapped. I'm not talking about a few frames; depending on the size and location of the cut, it could be a few seconds or even dozens of seconds of audio that get overlapped.
First, here's how it's supposed to work:
- Start a new project and import a longish clip (mine are a few minutes in length). Add the clip to the project.
- Using the I and O keys, select a portion of the clip and cut it using the Delete key. Do this a few times. Now the clip is broken up into multiple shorter clips.
- Add Cross Dissolve transitions to the cuts.
- Watch and listen to the whole project. It should be OK.
Now we'll replicate the bug:
- Start a new project and add the same clip to the new project.
- Expand the audio and video tracks using ^S or right-click on the track and selecting the "Expand Audio/Video" menu item.
- Cut out a few portions of the clip using the I/O keys and Delete.
- Watch the project. It should still be OK.
- Add a single cross dissolve transition somewhere in the timeline.
- Use the I/O keys to select a portion of the clip that's adjacent to the transition you just added. Delete it.
- You should see the audio tracks get overlapped.
You can also cause the bug with the blade tool:
- Do steps 1-5 above.
- In the clip adjacent to the transition, use the blade to place a cut in the clip.
- You should see the audio tracks get duplicated.
- Make another blade cut.
- Select the sub-clip you just created and delete it using the Delete key.
- Notice that the audio gets overlapped just like it did using the I/O keys.
The key steps seem to be expanding the audio/video AND adding the cross dissolve to the timeline. Until you do that, everything works fine. But as soon as you add a transition to a clip whose audio and video have been expanded, you get the overlapping audio.
Here are three workarounds I've found, both annoying:
- Don't expand audio/video.
- Don't add transitions until you are completely done editing.
- Trim the audio track adjacent to the transition. All you need to do is trim it a tiny bit -- a frame or two. Then cut out the desired portion of the clip as before. The audio won't get overlapped at all.
Is this a known problem?